The test piece for the final inspection today is the gun barrel blank. The outer circle is turned and the inner hole is bored, and the inner and outer walls of the gun barrel are precision processed.
Zhuang Qianding put the gun barrel blank weighing several kilograms into the three-claw chuck, clamped it firmly, positioned and calculated the size of the test piece, and after completing all this, he looked at the five lathes around him:
"Although this is the final test, it is also a complete turning process. Please pay attention to my operating steps. The material of the gun barrel is medium-low carbon alloy steel with medium hardness. The rotation speed does not need to be too high to avoid tool collapse and the amount of tool feed is small.
point."
"Yes, sir!" The five lathes nodded repeatedly, concentrating on studying and memorizing the operating instructions explained by Zhuang Qianding.
"Buzz!"
After the explanation, Zhuang Qianding turned on the lathe switch and started the entire lathe. The sound of a high-power DC motor was heard, and the spindle drove the barrel blank to rotate.
Steady control of the feed box with both hands, controlling the feed of the tungsten alloy turning tool, contacting the surface of the gun barrel blank, strips of wire-like metal shavings emerged, and the surface of the outer wall of the rotating gun barrel suddenly showed a silvery white luster.
.
Smooth, clean, like a mirror.
Seeing this scene, the five lathes were full of admiration. A layman looked at the excitement, and an expert looked at the door. Although they had seen the scene of mirror processing, when they saw it now, they still couldn't calm down.
Let’s not talk about this unimaginable machining effect. Let’s take the operation of Zhuang Qian Ding as an example. This is the integration of rough turning and fine turning. Only real masters can do this. Zhuang Qian Ding’s turning skills
It has reached the point of perfection.
Everyone held their breath and focused their eyes carefully on the operation steps of the Zhuang Qian Ding. They did not dare to be careless. This was a precious opportunity that no one could ask for. It was extremely rare for them to be selected to enter the machinery manufacturing factory.
Under the gaze of five people, after a few minutes, the outer circumference of the 120-centimeter-long gun barrel blank was completed. The gun barrel was silvery white. If you look carefully, you can clearly reflect the surrounding scenes. It revealed all the details of the gun barrel.
The sense of mechanical artistry is truly exquisite.
As a mortar tube, the processing quality and gold content of this blank are far higher than similar products from major domestic arsenals, and have reached the ceiling level of 60%.
After finishing the cylindrical turning, Zhuang Qianding stopped the machine tool, added a boring tool to the tailstock of the lathe, and then started the lathe again to boring the entire gun barrel blank.
For turning the outer circle and boring the inner hole, the dimensional accuracy requirements for mortar tubes are not as good as those for howitzers and cannons, so semi-precision boring can meet the requirements.
Of course, this operation cannot be performed by the lathe in the arsenal.
Fifteen minutes later, the sound of the machine tool's motor finally quieted down.
After the boring process of the gun barrel blank was completed, Zhuang Qianding took out the measuring tools such as the inner diameter micrometer and surface roughness comparison template that came with the lathe, and began to accurately measure the dimensional accuracy of the outer diameter and inner diameter of the gun barrel to obtain the inner and outer diameter surfaces.
A series of data such as roughness, dimensional accuracy and error values.
"Xiao Lin, record the final acceptance results. The surface roughness of the test piece is about 0.7 microns, achieving a mirror effect. The dimensional accuracy of the inner diameter semi-precision boring process is 60.03 mm. The dimensional accuracy error value is within the tolerance range..."
Zhuang Qianding, who had completed the precise measurement, continued to give various data to Lin Wan beside him, and finally gave the acceptance result: "According to the above data, the machining accuracy of the lathe has reached the standard level of new machines, and the main components and parameters
It meets the requirements and has been debugged and accepted three times as required. It has now passed the final acceptance."
The standard level of machining accuracy of the new machine is still some distance away from the theoretical maximum machining accuracy of this machine tool, and it requires a long period of running-in.
But even so, the processing accuracy level of the new machine is completely sufficient for local use.
After processing, the entire barrel blank has now become a true mortar barrel.
Lin Wan looked serious, wrote quickly, and used her own shorthand method to write down the final results and related content given by Zhuang Qianding word for word.
"The final acceptance has been passed. I announce that this GROB lathe has officially started construction. Comrade Hu, you will be the first to get started. You will first perform cylindrical and boring drilling, and conduct targeted training, and then gradually master the operation of this lathe."
Temper." After Zhuang Qianding finished speaking, he turned to look at the five lathes in front of him and said to Juan, who had the best score in the theory class.
Training workers is a route planned by Zhuang Qianding in advance.
Sharpening a knife is as good as chopping firewood. Zhuang Qianding alone cannot handle the processing of various and large quantities of parts.
Skills training is divided into two aspects, one is theory and the other is practical. Juan's turning theory test score yesterday reached 92 points. The other four people had a minimum score of 78 and a maximum of 88. He was the only one to break through the 90-point mark.
.
The theoretical assessment content is mainly based on GROB lathes, requiring every lathe to fully master the performance and characteristics of this machine tool, and be familiar with the outer circle, end face, ring groove, cutting, drilling, reaming, reaming, and boring.
Theoretical content of more than ten kinds of turning operations such as cones and threads.
Of course, there is no need to say much about the practical operation, just practice it on the machine and accumulate experience.
"Yes, sir."
Juan nodded respectfully, stepped forward, and came to the operating position, facing the entire machine tool. Feeling the aura of the big machine in front of him, he felt a little nervous.
Although I have learned a lot of theoretical knowledge about this machine tool, it is still my first time to get started with it.
"You have the best score in the training test. Stay calm and remember the operation essentials I talked about yesterday." Zhuang Qianding retreated to a safe distance and said seriously when he saw the nervousness on Juan's face.
After hearing this, Juan nodded seriously, took a deep breath to stay calm, recalled what he had learned over the past few days, and gradually regained his confidence.
After a few seconds, his eyes were clear and bright. After adjusting, he picked up the second barrel blank with both hands, placed it in the spindle, controlled the three-claw chuck to secure it firmly, and then positioned and measured it according to standard methods.
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After doing this, Juan pressed the switch and started the lathe. When the dull and high-frequency motor sound sounded, the spindle began to rotate. He controlled the feed box to control the feed of the tungsten alloy turning tool, and relied on his accumulated lathe experience to contact the gun barrel blank.
On the surface, turn the outer circle of the barrel bit by bit.
Rough turning first, then fine turning. He couldn't do the top-notch operation of Zhuang Qianding that integrates rough and fine parts.
The whole operation process is unfamiliar, slow and standard.
"Not bad." Zhuang Qianding paid attention to Juan's operation throughout the process, nodded with satisfaction, and showed his affirmation.
The other four lathes stared at Juan's operation. Each of them had a serious face and a solemn expression, as if they were facing a formidable enemy. Although they were experienced lathes, they were almost no different from novices in front of this advanced machine tool.
The only good thing may be the operational experience accumulated during the Guantian Arsenal period.
At this moment, Juan, who was the focus of the crowd, did not dare to be careless and focused on nothing. His eyes were always focused on the gun barrel blank in the lathe, and traces of metal shavings kept falling.
After more than twenty minutes, Juan controlled the lathe to stop, and the rapidly rotating spindle paused.
At this moment, the entire gun barrel blank has changed from its previous gray appearance to a silver-white form, as if covered with a silver coat. The surface is clean and smooth, but it does not reflect the mirror effect.
In addition, the inner hole of the gun barrel is enlarged, and the surface is as smooth as the outer wall.
"Sir, I've done it. The inner hole diameter is 60.2 mm..." After completing the first practical operation on the machine, Juan took out the inner diameter micrometer, accurately measured the dimensional accuracy and other data, and then recorded the dimensional data one by one, and then reported to Zhuang Qianding
reported.
The inner hole tolerance of the gun barrel is ±0.3 mm. Although the inner diameter of the gun barrel processed by Huan reaches 60.2 mm, it is still a qualified product.
Zhuang Qianding smiled and encouraged: "It's very good to be able to process it like this in the first practical operation. Summarize the operation experience and try to become a mechanical engineer if you have the opportunity in the future. Come on, Comrade Zhao."
Although these lathes have senior qualifications, their average actual age is only about 28 years old. Juan is smart, spiritual, and good at learning and summarizing. If he continues to develop, he may not be able to transform from a worker to an engineer.
"Yes!" Hearing Zhuang Qianding's evaluation, Huan was excited, kept calm, and responded in a serious voice.
Mechanical Engineer!
This is a career that many people dream of. Juan never thought that he had the qualifications to become a mechanical engineer.
Immediately afterwards, Zhao Cheng, who ranked second in theoretical scores, raised his hands in salute and stepped forward to start practical training. Not long after, the sound of motor running resounded in the turning workshop.
…
Time passed by minute by second, and the sky became darker.
After about five hours of rotational practical training, the five members of the lathe team have basically mastered the operating procedures of GROB machine tools and are familiar with the two processing methods of turning and boring.
"That's it for today's practical training. After we go back, we will sum up our experience. Tomorrow we will start processing the compressor unit of the air separation equipment and the three-hole oxygen lance. This is the top priority."
It was quiet in the workshop. Zhuang Qianding stood in front of the five lathe workers, looking around at everyone, looking at Li Nan and Zhao Cheng, and asked: "Also, Comrade Li and Comrade Zhao don't blame themselves too much. This is how mechanical processing is.
There are qualified products and there are defective products.”
There is good news and bad news for the first rotation of practical training.
The good news is that there are a total of fourteen barrels that are qualified after processing, and the bad news is that there are two defective barrels that exceed the maximum range of the inner diameter tolerance.
Next, the qualified products are sent to the arsenal, and the unqualified products are remanufactured.
There are two unqualified products, one with an inner diameter of 60.4 mm and one with an inner diameter of 60.6 mm. Even though the inner diameter does not exceed the tolerance by much and can be fired with a cannonball plugged in, Zhuang Qianding still classifies it as unqualified and is absolutely not allowed.
Its troops are deployed.
In military production, there is no room for error.
Li Nan and Zhao Cheng in the lathe team had helpless faces and deep self-blame in their eyes. They did not expect Zhuang Qianding to be so strict, especially Zhao Cheng, who processed the 60.4mm inner diameter gun barrel.
It only exceeds the tolerance by 0.1 mm. In the era of Guantian Arsenal...
What does 0.1mm count?
This error is simply not important.
However, no matter how much he begged Zhuang Qian Ding not to classify it as defective, the final result remained the same.
Zhao Cheng didn't understand, but he didn't dare to get angry, and his inner emotions gradually turned into self-blame.
You must know that the organization is extremely difficult now. Many comrades do not have enough to eat or wear warm clothes, but he has personally scrapped a valuable mortar tube.
This feeling...
It almost made him suffocate, and it was an unparalleled heartache.
This one-meter-two-meter-long barrel can be made into two mortars according to the 600-mm length of the arsenal's 60-mm mortar, and two scraps are equal to four guns.
That’s a whole four doors!
Li Nan's eyes were full of self-blame and regret. He didn't dare to get angry at Zhuang Qianding, who taught him skills and knowledge, and he didn't dare to ask any questions. He could only blame himself for why he was so nervous at the time.
However, there is no regret medicine in the world.
Juan and others next to him were equally distressed, and wanted to remanufacture the two gun barrels with such excellent quality...
"Report, sir, I have a suggestion." Juan pursed his lips, and when Zhuang Qianding was about to announce a break, he suddenly raised his right hand.
"Tell me, if it's still about two substandard products leaving the factory, there's no need to talk about it." Upon seeing this, the interrupted Zhuang Qianding nodded, and then took a vaccination.
"Sir, we think it's a pity to recycle those two scraps. Can we make them into mortars and sell them to others?" Juan took a deep breath and expressed his inner thoughts.
Turn it into mortars and sell them to others?
Hearing Juan's idea, Zhao Cheng and Li Nan were startled for a moment, then immediately raised their heads, and the other two workers' eyes lit up.
Zhuang Qianding frowned slightly when he heard the words. He was about to refuse, but he stopped when the words reached his throat. He pondered for a while and said, "Please tell me carefully."
"We use good barrels that meet the tolerances ourselves. Unqualified barrels are still turned into mortars and sold to the Shanxi-Sui Army, the Northeastern Army, etc. My fellow soldier in the Red Sixth Army said that in 1936, there was no one on the market.
The Men 60 gun cost 1,500 oceans, and now it may rise to 2,000 oceans. If it is an imported gun, such as a German one, the price may be even higher."
Juan said carefully: "Look, 2 gun barrels can be made into 4 guns. Calculated based on 2,000 oceans, there are 8,000 oceans. In this way, it will not only solve the problem of defective products in the factory in the future, but also provide a good service for the factory."
After all, in order to make money for the organization, we have to remanufacture such a good barrel. Not only do we feel it is a pity, but other comrades also feel the same."
Use the good ones for yourself, and give the bad ones to others.
In terms of quality alone, the two scrap gun barrels are definitely better than the mortars produced by Taiyuan Arsenal. Four guns can be sold for at least 8,000 yuan.
There was a brief silence in the workshop.
Hearing the words, Zhuang Qianding fell into thinking. He had to say that what Juan said made sense. The thing he cared about most was that the scrap barrels could never be used in the army.
However, if sold to others for use...
Whether it's limited performance or some other situation, in a word, it doesn't matter.
Looking at the appearance of Zhuang Qian Ding, Juan breathed a sigh of relief, and the other four people all looked expectant, something exciting!
"I understand. The two waste products will not be sent back to the electric furnace steel factory for the time being. I will go to the headquarters to discuss this issue with Director Chen. You guys should go back and have a good rest. We will start processing the compressor unit parts tomorrow." Zhuang Qianding thought about the balance and agreed with Hu.
With this thought in mind, An raised his head and looked at the five members of the lathe crew, arranging the work in an orderly manner.
"Yes, sir!" the five people responded in unison.
Seeing this scene, Zhuang Qianding smiled without saying anything. He turned around and left the turning workshop with Lin Wan, heading for the headquarters of the Military Industry Bureau.
…
Military Industry Bureau Headquarters.
"That's the thing. If the scrap barrels are disposed of in this way, I think it's feasible. It's better to sell a mortar than to remanufacture it." In the cave meeting room, Zhuang Qianding informed Chen Kang of the news.
Finally, give your own evaluation.
After hearing this, Chen Kang felt his scalp numb and scratched his head: "Professor Zhuang, can't we really use this kind of gun barrel that only exceeds the tolerance by 0.1 mm?"
0.1mm?
If the inner diameter exceeds 0.1 mm, it must be classified as defective.
Ma Li was on top, and Chen Kang felt like he was going crazy.
"Absolutely not. When it comes to military production, there is no concession. This is a matter of principle." Zhuang Qianding nodded seriously: "I don't care what others think. Anyway, in my case, products that exceed tolerances must not be equipped with troops. If you insist on using them,
If so, then I will go find General Liu or the boss."
"..."
Feeling the tough attitude from Zhuang Qianding, Chen Kang moved his mouth, trying to persuade him, but looking at Zhuang Qianding's appearance, he had no choice but to nod and give in, with a wry smile on his face, and said helplessly: "Don't get angry, I just feel sorry for you.
, I need to report the disposal method of scrap gun barrels and get the boss’s approval. After all, this is considered arms sales.”
There is nothing to say about this method of handling, and Chen Kang can accept it. Nowadays, the financial pressure on organizations is very high. If you can make money by relying on scrap gun barrels, it can greatly alleviate the financial pressure on the organization.
As the Japanese army launched an all-out war of aggression against China, the price of weapons and ammunition on the market has skyrocketed. The price of a 60-gun has almost doubled from 1,900 yuan in July to 3,500 yuan now.
But just like that, there is still a price but no market.
"I see."
Seeing this, Zhuang Qianding calmed down, and then gave the recent situation and future arrangements: "At present, the lathe team has been trained and has mastered the most basic operations. Next, I will lead them to process the compressor unit, three-hole oxygen gun and other major tasks.
Parts and components should be supplied to Yulin Iron and Steel Plant first, and then the single-cylinder diesel engine will be built."
Chen Kang nodded: "Okay, is there anything you need me to do?"
"No, technically you don't have to worry about it." Zhuang Qianding shook his head.
"..."
Chen Kang was speechless after hearing this, and could only look at Lin Wan beside him: "Comrade Lin, how is the cement factory? The supply of cement produced by vertical earth kilns has been very tight recently, and the Yushen and Yanma highways are often shut down.
In addition, the construction of the test furnace of Yulin Iron and Steel Plant has been started, which also requires a large amount of cement."
There are four vertical earth kilns in Liushugou, each with a daily output of 500 kilograms, and a total daily output of two tons. There are three vertical earth kilns in Yulin, with a daily output of 1.5 tons of cement.
This cement is far from satisfying the appetite of the two major highways, Yushen and Yanma. The Yushen Highway is 12 meters wide and has a mileage of about 80 kilometers. The Yanma Highway is about 6 meters wide and has a mileage of more than 200 kilometers. It adopts a multi-stage construction method.
, various construction teams are waiting for food every day, just waiting for cement.
"The first cement plant will be put into operation in half a month. The small rotary kiln will be built soon. The daily output is expected to be 25 tons. Yesterday, Comrade Zhao Zhangcheng organized a team to build three new vertical earthen kilns in Liushugou. The daily output can increase by 1.5 tons. Over there in Yulin
We also built three new vertical earthen kilns." Lin Wan responded like a treasure trove.
During this time, she and Zhao Zhangcheng were almost in a continuous state. They were extremely busy, running back and forth between the cement factory and the vertical earth kilns to provide technical guidance. In addition, they also had to record data and study next to Professor Zhuang.
Knowledge.
Fortunately, the small rotary kiln at the cement factory is on track, and the supporting facilities will be completed soon. It will be officially put into operation in half a month.
When he heard about the cement situation, Chen Kang did not give any instructions. He looked at the fatigue between Lin Wan's eyebrows and said softly: "Thank you for your hard work."
"It's not hard work. The real hard work is for the soldiers who mine the mines and the soldiers who drive the carriages to pull the goods..."
Lin Wan shook her head gently: "What I did can be said to be insignificant."
Countless soldiers put down their guns and carried out various kinds of work under the scorching sun, carrying sand, gravel and cement on their shoulders.
Is she working hard?
Not really.
They are the ones who really have the hard work.
"It's all hard work. You don't need to say it like this. We see your contribution." Hearing these words, Chen Kang was startled for a moment, and he was full of affirmation of Lin Wan in his heart. He continued: "Okay, this briefing will end here.
, I will immediately hand over the disposal method of the scrap gun barrel in writing."
Zhuang Qianding and Lin Wan nodded, then left, each getting busy.
The soldiers at Liushugou Arsenal are almost working in two shifts, and all the equipment barely takes a breath unless necessary.
Everything is for construction, everything is for the future.
After the two people left, a confidential document was handed over to the cave dwelling soon after. After discussion and decision-making by the trio, they finally agreed on how to dispose of the waste gun barrel.
At the same time, the Liushugou Arsenal, which received the first batch of fourteen qualified gun barrels, is preparing to manufacture the first 60mm mortar belonging to the organization.